Involvement of PPAR receptors in the anticonvulsant effects of a cannabinoid agonist, WIN 55,212-2

Cannabinoid and PPAR receptors show well established interactions in a set of physiological effects. Regarding the seizure-modulating properties of both classes of receptors, the present study aimed to evaluate the roles of the PPAR-gamma, PPAR-alpha and CB1 receptors on the anticonvulsant effects of WIN 55,212-2 (WIN, a non selective cannabinoid agonist). The clonic seizure thresholds after intravenous administration of pentylenetetrazole (PTZ) were assessed in mice weighing 23-30 g. WIN increased the seizure threshold dose dependently. Pretreatment with pioglitazone, as a PPAR gamma agonist, potentiated the anticonvulsant effects of WIN, while PPAR gamma antagonist inhibited these anticonvulsant effects partially. On the other hand PPAR alpha antagonist reduced the anticonvulsant effects of WIN significantly. Finally the combination of CB1 antagonist and PPAR alpha antagonist could completely block the anticonvulsant properties of WIN. Taken together, these results show for the first time that a functional interaction exists between cannabinoid and PPAR receptors in the modulation of seizure susceptibility. (C) 2014 Published by Elsevier Inc.